Need help chosing the right element

Im building a smoker similar to a cookshack sm260. They use 2- 220v 1500w elements. Another brand uses 2-110v 700w element. Any advice on how much wattage I need for 16 cu ft? The hottest i would smoke at would be 275. Hopefully this post will get more attention in this part of the forum.

This is the one I have I have a controller on my that I can only let it go to 220* BUT if I buy pass the controller and go stright to the element no problem going to 275* I just like to control mine, you could also get this and a Aubins controller and do the same. I will say my build is a old Fridge build.